The problem was that sometimes the serial driver wouldn't send the data loaded into the FIFO. Conversations with the modem would hang (and chat would eventually time out) -- or the connection would be made between modems, but I'd get a LCP timeout error -- from the same cause. You may only get bit by this with particular UART hardware -- ours was detected (correctly) as a 16550A. You should be able to find out what yours is by either grep 'serial' from /var/log/messages, or setserial -a /dev/ttyS0. The problem did not occur on another machine with a NS16550A detected. The problem kernel we had was 2.6.18 (and various minor versions up to 2.6.18-89). cfowler-2 wrote: > > I'm running ppp on a dual core P4. I'm interested to know what problems > you are seeing. I run ppp in demand mode. We use it heavily. I was > running it on FC2 with 2.6.10 but now I've switched to CentOS 5 > 2.6.18.... kernel. > > In demand mode we have a program that is ran as if-down and if-up. This > is because another device can call in and gain the same address as the > interface waiting. The program downs the other interface and will up a > down interface when ppp dies. It is hard to explain but it makes 2 > devices work in demand mode with each other. > > > On Fri, 2008-04-18 at 11:41 -0700, bfc wrote: >> I should follow this up for search purposes. This was Redhat bug 440121, >> a problem with the serial driver on SMP machines. That explains all the >> troubles I posted about. I'm sure it affects other distros, too, but >> I suspect not many people are using higher end machines for PPP? >> >> >> James Cameron-2 wrote: >> > >> > ATH hangs up. Perhaps the loss of CTS and DSR from the modem causes >> the >> > kernel and your terminal emulator to see nothing more. >> > >> > Either configure the system to ignore the loss of CTS and DSR, or >> > configure the modem not to drop CTS and DSR during a hangup. Then try >> > again. >> > >> > I've no idea why you want to see anything more after ATH though. >> > >> > -- >> > James Cameron >> > http://ftp.hp.com.au/sigs/jc/ >> > -- >> > To unsubscribe from this list: send the line "unsubscribe linux-ppp" in >> > the body of a message to majordomo@xxxxxxxxxxxxxxx >> > More majordomo info at http://vger.kernel.org/majordomo-info.html >> > >> > >> > > -- > To unsubscribe from this list: send the line "unsubscribe linux-ppp" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- View this message in context: http://www.nabble.com/modem-session-behavior-tp16169308p16824945.html Sent from the linux-ppp mailing list archive at Nabble.com. -- To unsubscribe from this list: send the line "unsubscribe linux-ppp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
